[openib-general] question on QoS support

[Sasha Khapyorsky]

On 16:52 Wed 01 Nov     , Oliver wrote:
> Hi, folks -
> 
> I am trying to verify and evaluate IB QoS support, running openSM as
> subnet manager. The perftest program is extended to set SL as command
> line options instead of default 0, and by modifying VL arbitration
> tables, I am expecting to see the traffic shaping can actually take
> place, but it did not.  More details on configuration:
> 
> in opensm.opts:
> # QoS default options
> qos_high_limit 255 # disable low priority table
> qos_vlarb_high: 0:4,1:4,2:8,3:0, 4:0 .... # this is to give VL 2
> (corresponding to SL 2) a higher weight 8
> qos_sl2vl 0,1,2,3,4, ... # no changes here
> 
> I think (though not verified) the Voltaire HCA we are using can
> support 8 data VLs. I don't have much more information to go on why
> qos shaping is not taking place, any suggestions?

You can verify actual port's parameters with smpquery (from diags), you
will need to run to get QoS related parameters:

  smpquery portinfo ...
  smpquery vlarb ...
  smpquery sl2vl ...

Sasha

> A related question is, if I modify qos setting in SM, do I need to
> restart SA on each hosts for it to see the changes? (I am hoping not,
> as I tried in the test, it doesn't seem to make a difference)
> 
> Thanks for help.
> -- 
> Oliver
> 
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